True statement for 1 mole of salt, water and hydrogen is that they have the same number of atoms and different masses.
Avogadro's Number is that number which tells about the number of entities present in one mole of any substance and it is equal to 6.022×10²³.
Means in one mole of any substance 6.022×10²³ number of atoms of that substance will present.
Relation between moles and mass will be represented as:
n = W/M, where
W = given mass
M = molar mass
So for any given moles, mass of substance will be different as molar mass of all substances are different.
According to given two concepts in 1 mole of salt, water and hydrogen same number of atoms are present but they all will have different masses.
Hence, they have the same number of atoms and different masses.
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